I have recently installed the FMOD Unity integration into the Viking Village level. I have used the latest versions of Unity, The integration package, and FMOD Studio. There are however several problems I have encountered when trying to use the game level. These problems include the following error messages.

Lighting data asset ‘LightmapSnapshot’ is inconsistent because 68 files out of 272 are missing. Please use Generate Lighting to rebuild the lighting data.
UnityEngine.GUIUtility:ProcessEvent(Int32, IntPtr)

GameObject is active but a parent is inactive. Active state is now inherited. Change the parenting to get back the old behaviour!
UnityEngine.GUIUtility:ProcessEvent(Int32, IntPtr)

As I am new to Unity, I don’t know what these mean, but what it results in game level’s sky becoming a weird multi colour.

For the NullReferenceException, it looks like something may not have imported properly, close the Unity project and delete:
– Assets/Plugins/Editor/FMOD
– Assets/Plugins/FMOD
Then re-import the FMOD Studio Integration package.

As for the lighting, you can rebuild the lighting via Window->Lighting->Settings.